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//===-- llvm/CallingConvLower.cpp - Calling Conventions -------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Chris Lattner and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the CCState class, used for lowering and implementing
// calling conventions.
//
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/CallingConvLower.h"
#include "llvm/Target/MRegisterInfo.h"
using namespace llvm;
CCState::CCState(const MRegisterInfo &mri) : MRI(mri) {
// No stack is used.
StackOffset = 0;
UsedRegs.resize(MRI.getNumRegs());
}
/// MarkAllocated - Mark a register and all of its aliases as allocated.
void CCState::MarkAllocated(unsigned Reg) {
UsedRegs[Reg/32] |= 1 << (Reg&31);
if (const unsigned *RegAliases = MRI.getAliasSet(Reg))
for (; (Reg = *RegAliases); ++RegAliases)
UsedRegs[Reg/32] |= 1 << (Reg&31);
}
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